Convertible chair ladder



FIG. 1 is a front perspective view of a convertible chair ladder, in chair mode, showing our new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is an elevation of one side thereof, the opposite side elevation being a mirror image;

FIG. 5 is a top plan thereof;

FIG. 6 is a bottom plan thereof;

FIG. 7 is a front perspective view thereof in ladder mode;

FIG. 8 is a front elevation thereof;

FIG. 9 is an elevation of one side thereof, the opposite side being a mirror image;

FIG. 10 is a rear elevation thereof;

FIG. 11 is a top plan thereof; and,

FIG. 12 is a bottom plan thereof. 

The ornamental design for a convertible chair ladder, as shown and described. 